China's trade surplus increased to $18.4 billion in April from $5.4 billion in March. Exports were up 4.9%, slower than expected and down from 8.9% in March. But imports went up by only 0.3%, much lower than March's 5.3% increase. The hopes for improving the trade balance in recent months may be dashed because of slowing imports for infrastructure development, as economic growth slows in China, even as export growth declines from its earlier high levels.